主　　催： 繊維学会西部支部、九州大学　G-COE「未来分子システム科学」

共　　催： 九州大学　高分子機能創造リサーチコア

開催日時： 平成23年5月28日（土）11時00分〜12時30分

開催場所： 九州大学伊都キャンパス ウエスト4号館 物質5番講義室

講師氏名： Prof. Binyang Du

所 　 属： MOE Key Laboratory of Macromolecular Synthesis anFunctionalization,
           Department of Polymer Science & Engineering, ZhejiangUniversity,
           Hangzhou 310027, China

題　　目： Solution Behavior of PNIPAm-PEO-PPO-PEO-PNIPAm PentablockTerpolymer

概　　要： The double thermo-sensitive and narrow dispersed

PNIPAm-PEO-PPO-PEO-PNIPAm pentablock terpolymers were synthesized by the
typical atomic transfer radical polymerization (ATRP) method with
N-isopropylacrylamide (NIPAm) as the monomer and modified F127
[poly(ethylene oxide)100-poly(propylene oxide)65-poly(ethylene oxide)100
(PEO100-PPO65-PEO100)] or P123 (PEO19-PPO69-PEO19) block copolymer as the
macroinitiator.  Micro-differential scanning calorimetry (Micro-DSC) data
showed that the pentablock terpolymer exhibited two low critical solution
temperatures (LCSTs) in the aqueous solution, which were can be attributed
to the thermal phase transition of the PPO block and PNIPAm block,
respectively.  The values of LCSTs were dependent on the block lengths of
PNIPAm, PEO, and PPO.  The chain conformation of the pentablock terpolymer
in aqueous solution was studied in details by using a combination of static
and dynamic laser light scattering (SLS & DLS).  The SLS & DLS results
indicated that the loose “associates” and single coil chains coexisted in
the aqueous solution at the low temperature, where the PEO, PPO, and PNIPAm
blocks were soluble in water. At the high temperature above the LCSTs of PPO
and PNIPAm blocks, the pentablock terplymer chains formed large and stable
core-shell micelles with collapsed PPO and PNIPAm cores and swollen PEO
shells.  The sizes of “associates” and micelles were related with the
block lengths of the pentablock terpolymers.